docs: def list_opts():
      """List all conf modules opts.
  
      Goes through all conf modules and yields their opts.
  
      """
      for mod in load_conf_modules():
          mod_opts = mod.list_opts()
          if type(mod_opts) is list:
              for single_mod_opts in mod_opts:
                  yield single_mod_opts[0], single_mod_opts[1]
          else:
              yield mod_opts[0], mod_opts[1]